/* Copyright (C) 1997-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#ifndef _AIO_MISC_H

#define _AIO_MISC_H	1

#include <aio.h>

#include <pthread.h>

/* Extend the operation enum.  */

enum

{

  LIO_DSYNC = LIO_NOP + 1,

  LIO_SYNC,

  LIO_READ64 = LIO_READ | 128,

  LIO_WRITE64 = LIO_WRITE | 128

};

/* Union of the two request types.  */

typedef union

  {

    struct aiocb aiocb;

    struct aiocb64 aiocb64;

  } aiocb_union;

/* Used to synchronize.  */

struct waitlist

  {

    struct waitlist *next;

    /* The next two fields is used in synchronous `lio_listio' operations.  */

#ifndef DONT_NEED_AIO_MISC_COND

    pthread_cond_t *cond;

#endif

    int *result;

    volatile unsigned int *counterp;

    /* The next field is used in asynchronous `lio_listio' operations.  */

    struct sigevent *sigevp;

  };

/* Status of a request.  */

enum

{

  no,

  queued,

  yes,

  allocated,

  done

};

/* Used to queue requests..  */

struct requestlist

  {

    int running;

    struct requestlist *last_fd;

    struct requestlist *next_fd;

    struct requestlist *next_prio;

    struct requestlist *next_run;

    /* Pointer to the actual data.  */

    aiocb_union *aiocbp;

    /* List of waiting processes.  */

    struct waitlist *waiting;

  };

/* Lock for global I/O list of requests.  */

extern pthread_mutex_t __aio_requests_mutex attribute_hidden;

/* Enqueue request.  */

extern struct requestlist *__aio_enqueue_request (aiocb_union *aiocbp,

						  int operation)

  attribute_hidden;

/* Find request entry for given AIO control block.  */

extern struct requestlist *__aio_find_req (aiocb_union *elem) attribute_hidden;

/* Find request entry for given file descriptor.  */

extern struct requestlist *__aio_find_req_fd (int fildes) attribute_hidden;

/* Remove request from the list.  */

extern void __aio_remove_request (struct requestlist *last,

				  struct requestlist *req, int all)

     attribute_hidden;

/* Release the entry for the request.  */

extern void __aio_free_request (struct requestlist *req) attribute_hidden;

/* Notify initiator of request and tell this everybody listening.  */

extern void __aio_notify (struct requestlist *req) attribute_hidden;

/* Notify initiator of request.  */

extern int __aio_notify_only (struct sigevent *sigev) attribute_hidden;

/* Send the signal.  */

extern int __aio_sigqueue (int sig, const union sigval val, pid_t caller_pid)

     attribute_hidden;

#endif /* aio_misc.h */